one.cpp

简单的罗马数字转换程序

//add comments
//constructor

#include <iostream>
#include <string>
using namespace std;

class Roman
{
	private:
		string romanIn;
		int result;
		void convert();
	public:
		void setRoman(string);
		void printDecimal();
};

void Roman::setRoman(string s)
{
	romanIn = s;
}

void Roman::printDecimal()
{
	convert();
	cout << result;
}

void Roman::convert()
{
	int* dec = new int[romanIn.size()];
	
	for(unsigned int i=0;i<romanIn.size();++i)
	{
		switch(romanIn[i])
		{
			case 'M':
				dec[i] = 1000;
				break;
			case 'D':
				dec[i] = 500;
				break;
			case 'C':
				dec[i] = 100;
				break;
			case 'L':
				dec[i] = 50;
				break;
			case 'X':
				dec[i] = 10;
				break;
			case 'V':
				dec[i] = 5;
				break;
			case 'I':
				dec[i] = 1;
				break;
		}
	}
	
	result = 0;
	
	for(unsigned int i=0;i<romanIn.size()-1;++i)
	{
		if(dec[i]<dec[i+1])
			result -= dec[i];
		else
			result += dec[i];
	}
	result += dec[romanIn.size()-1];
	
	delete [] dec;
}

int main()
{
	Roman roman;
	string romanString;
	cout << "Enter a roman number: ";
	cin >> romanString;
	cout << endl;
	roman.setRoman(romanString);
	cout << "The equivalent of the Roman numeral " << romanString << " is ";
	roman.printDecimal();
	cout << endl;
	

	return 0;
}